As I found out the writing permissions aren't changed on updating but are set correctly on an new installation. So please try this:
Add the PPA repository
sudo apt-get remove brother-*
sudo rm -r /usr/Brother
sudo apt-get install brother-cups-wrapper-extra
As I found out the writing permissions aren't changed on updating but are set correctly on an new installation. So please try this: cups-wrapper- extra
Add the PPA repository
sudo apt-get remove brother-*
sudo rm -r /usr/Brother
sudo apt-get install brother-
After this it should work.